For those of us facing battery problems on android 4.4.2. Follow this:
1- Settings -> Apps -> All -> Google Play Services
2- Clear cache
3- Click Manage Space, then Clear all data
4- Back, disable, it will ask you to revert to older version, say YES
If you have Uninstall Updates, do it.
If it says you can’t disable because of administrators, click manage administrators and deselect the softwares (there were 3, one of them is Sony My Xperia, disabled it)
5- Once disabled, restart Xperia phone
6- You may notice errors etc…, its ok, its only temporary. You can switch off notifications from apps that send error messages
7- Once rebooted, go again to apps, and enable Google Play Services. You can also enable it through Hangouts app. But don't update it to the latest version. Leave it that way till the new 4.4.4 is released

ahmed kfc, 02 Sep 2014im in EGYPT the phone have english and chaineise apps put the play store didn't found on it ... moreGo on XDA developpers website(google it) and look for a tutorial on how to Flash the firmware.
All you need is a flashtool and a android 4.4.2 firmware for Xperia Z.
Look for a video on youtube to see how you can do that. It's easy. I hope the links will stay and the admin won't remove them.
Good luck!